nur12
at all the sizing of the any kind of vessel is a process design criteria not mechanical then you should ask a process engineer to calculate it according to the process requirement
Please take a general point in this regard (not to austenitic S.S) that for rolled plates that the grains stretched in the rolling direction the mechanical properties in this direction -normally- is above the transverse direction. It means the tensile properties of the sample that the length is...
Pipewelder1999
Thanks for your reply. But new PQR is necessary for reducing of 50 C from starting preheat temp. in PQR or from Max. temp. during welding in PQR?
If in preparing of test coupon for PQR I have the min. preheat temp. as starting temp. of welding, about 80 C and during the progress of the welding the temperature of the coupon raised for example to 250 C. May I specify the Min. Preheat Temp. in WPS as 30 C because of the para. QW406.1 of ASME...
If in preparing of test coupon for PQR I have the min. preheat temp. as starting temp. of welding, about 80 C and during the progress of the welding the temperature of the coupon raised for example to 250 C. May I specify the Min. Preheat Temp. in WPS as 30 C because of the para. QW406.1 of ASME...
One of major point of inspection of the weld specially in one side welding that may effects on the quality of an existing WPS is root pass.
More over there is only One para. in ASME Sec. IX (QW-200.4) that discused about root pass requirement and it seems that changing of root pass is not...
IT DEPENDS TO THE RATIO OF THE DEPTH OF REPAIR AREA TO THE THICKNESS OF THE PARTS TO BE REPAIRED. YOU CAN REFER TO THE "NATIONAL BOARD" FOR REPAIRING WITHOUT SECONDARY PWHT.
There are many thing to know than select the acceptance limits for fracture toughness requirment that main is the material specification that have been used for example in the ASTM A20 you can find the requirments for many common material that are used in pressure vessel construction.
the...
Dear degas
If you check the ratio of yeild to tensile of materials that have been accepted by ASME code and compair with the API material it will be appeared that there is many diference together. I think that using the API material is not so safe for design according to ASME. I think that you...
The contour of the internal and external surface of the head and the shell shall be consider. if you have not a transition region for stress flow then it seems that it shall consider as flat head then you shall have the min. thickness (at bottom of concave) equal to calculated flat head...
Hi arksurat
I think that it depend to the radius that you have and radius which you should recieve.
It is not practicable to recieve larger radius from smaler and also it depends to capabilities of your forming equipments.
In any way the table UG-37 of ASME Sec.viii-1 may be a guide to find the...
There are some question regarding to ASME new allowable stress.
1- How does know the reason or philosophy of changing - or better say - increasing of the allowable stress since 1999.
2- Is it based on improving of steel making , vessel fabrication or maintenance systems.
3- If we have some...
